Global Patent Index - EP 0634861 A3

EP 0634861 A3 20000112 - Subscriber line circuit for connecting a subscriber line with a digital time division exchange

Title (en)

Subscriber line circuit for connecting a subscriber line with a digital time division exchange

Title (de)

Teilnehmeranschlusssatz für den Anschluss einer Teilnehmeranschlussleitung an eine digitale Zeitmultiplex-Fernsprech-vermittlungsstelle

Title (fr)

Circuit de ligne d'abonné pour raccorder une ligne d'abonné à un auto-commutateur temporel numérique

Publication

EP 0634861 A3 20000112 (DE)

Application

EP 94110144 A 19940629

Priority

DE 4323281 A 19930712

Abstract (en)

[origin: EP0634861A2] This circuit contains at least one alarm indication circuit (R1 to R12; OP) for detecting direct-current signals, which is additionally used for detecting contacts by the wires of the subscriber line with the power line in that it is preceded by bypass components (D1 to D4) which limit power line voltages to such an extent that the alarm indication circuit will not be overdriven, and in that it is followed by a time assessment circuit (TA) for distinguishing between power line voltage and direct-current signals. <IMAGE>

IPC 1-7

H04M 3/18; H04Q 11/04

IPC 8 full level

H04M 3/08 (2006.01); H04M 3/18 (2006.01); H04Q 11/04 (2006.01); H04M 3/00 (2006.01)

CPC (source: EP)

H04M 3/08 (2013.01); H04M 3/18 (2013.01); H04M 3/005 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IE IT LI NL PT SE

DOCDB simple family (publication)

EP 0634861 A2 19950118; EP 0634861 A3 20000112; EP 0634861 B1 20020828; AT 223128 T 20020915; DE 59410174 D1 20021002

DOCDB simple family (application)

EP 94110144 A 19940629; AT 94110144 T 19940629; DE 59410174 T 19940629